Are exotic speaker cabinet materials overrated?

@simao The North Creek Music (George Short) Glop recipe is a 50/50 mixture of their soft glue and drywall compound. I’m not sure what NCM Soft Glue is or what a commercially available product might be, but have heard Aleene’s Original Tacky Glue is a close substitute. 

Do these exotic materials really contribute to a better sound or do they add an unnatural quality to the sound. 

I don’t believe we can make generalizations as it mostly depends on the execution.  Regarding resonance, speaker design varies from not a main issue, to tuning, to some mitigation up to Herculean mitigation which is typically a very costly process like Magico, Rockport, Tidal speakers.

I don’t get caught up in the materials, what’s important is how it sounds and the cost/affordability.  

Some of the exotic materials especially Wilson’s can actually deaden the sound too much were the speakers can become unnatural sounding lacking life to the music.

Does anyone know what kind of material Kharma speakers have ? 

A Speaker is a Transducer, which is another name for a conversion. 

Electrical Energy is converted to Mechanical Energy and onwards into Kinetic energy being Amitude received as sound. The Cabinet is a design to optimise the mechanical to Kinetic energy conversion. 

The Cabinet is exposed to energies created. 

The Cabinet design is for certain designs, one that is considered to assist with managing created energies and some are solely for the optimisation of the production of sound. 

It is typical for the models that have the most considerations for the design, will be models commanding a premium price. 

Making references to how a material effects sound is a weak assessment, as a Speaker produced from an established producer, is never experienced in a Typical listening environment. Whilst heard when undergoing design, due to the used environment being purpose produced for managing sound in the space, any typical  space used beyond design will not be a mimic.